i have a 35 gallon Hex tank with 3 cichlids in it, a blue electric (3 inch), a green terror (4 inch), and a giraff spoted one i dont know what he is but hes about 3 inches also...well i recently did a water change and put a big flat rock in one of the corners of the tank...its been about 2 weeks since i added the rock, which i did because i read somewhere that cichlids like flat rocks for some reason.....but anyways now when ever the fish hang out over there they flip on there back and do alot of flashing over it...but only over the rock...it just worries me because the green terror and the giraff one will flip all the way over on their back...the electric blue doesnt seem to even notice that its thier but the others act funny.... is this normal?

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It's normal if they do it occasionally. But if they do it incessantly then their skin is irritated by something, like a disease or a water problem.

A 35 hex is too small for those fish, but that is not contributing to the flashing (rubbing on the rock). Do you have a plan for a larger tank for them? The electric blue (fryeri) needs 48" x 18" or larger and the giraffe (venustus) needs a 72" tank. At 3" and 4" they are grown out enough now to be ready for their larger tanks.